Tem = input("请输入带有符号的温度值")
if Tem[-1] in ['F','f']:
    C = (eval(Tem[0:-1]) - 32)/1.8
    print("转换后的温度是{:.2f}C".format(C))
elif Tem[-1] in['C','c']:
    F =1.8*eval(Tem[0:-1]) + 32
    print("转换后的温度是{:.2f}F".format(F))
else:
    print("输入格式错误")